Improved cement



UNITED STATES PATENT OFFICE.

PIERRE A. LETOURNEUR, OF NEW ORLEANS, LOUISIANA.

IMPROVED CEMENT.

Specification forming part of Letters Patent No. 29,979, dated September 11, 1860.

To all whom it mag renown:

Be itknown that I, PIERRE A. LETOURNEUR, of New Orleans, parish of Orleans, in the State of Louisiana, have invented a new composition for covering roofs, 850., so as to make such roofs, 860., proof against both fire and water, of which the following is a specification.

My invention is an indestructible cement, which consists of the following compound, to wit: red oxide of iron, one gallon; white zinc paint, (oxide of zinc,) one gallon; plaster-ofparis, one-half of a gallon; linseed-oil, boiled, one gallon.

Manner of preparing the cement: Take half a gallon of water, warm it, and dissolve into it half a pound of potashchemists call it, I believe, carbonate of potash, but it is the common potash I nieanand one-fourth of a pound of borax. Let the water get cool and then put in the linseed-oil, and when well mixed up put in the three first-named ingredients, and mix up the whole until it has the consistency of and may be used as a paint.

Manner of using it: Nail a light canvas over the place to be covered, placing the nails at thedistance of two inches from each other. Then make use of the above preparation as if it were paint. Give a second and third coat at twenty-four hours distance from each other, and with a perforated tin. box sprinkle it over with white sand, and in a very few days the cement, bcin g dry and hard, will afford a cover both fire and water proof. The canvas might receive the two first coats of cement before being put up, and then when dry be put upon the place intended to be covered, when the third coat is to be given.

What I claim as my invention, and desire to secure by Letters Patent, is-

A cement which I call indestructible cement, composed of the above substances, prepared as aforesaid, which will make the roofs and other places covered with it both fire and water proof.

P. A. LETOURNEUR. Witnesses:

J. EDMUND, H. BRUNE. 

